Fair Value - Financial Instruments Carried at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Assets:
Derivatives	$ 259	$ 92
Mutual funds	39	3
Total	298	95
Liabilities:
Derivatives	58
Total	58
Level 1
Assets:
Derivatives	0	0
Mutual funds	39	3
Total	39	3
Liabilities:
Derivatives	0
Total	0
Level 2
Assets:
Derivatives	259	92
Mutual funds	0	0
Total	259	$ 92
Liabilities:
Derivatives	58
Total	$ 58